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4 years ago

How do you know how many valence electrons are in a molecule?

Chemistry

2 answers:

telo118 [61]4 years ago

4 0

1. by making a atomic configuration
2.by making a table of shells of k.l.m.n....
that's all

Leno4ka [110]4 years ago

4 0

To know the number of valence electrons you must know the number of electrons in the outer shell .. In the periodic table there are 8 groups (which are the vertical columns) .. ignore the yellow ones for now which are the transition metals .. the group number is the number of electrons in the most outer shell of an atom .. so for example lithium and sodium are in group 1 so they have only 1 electron in their outer shell .. the valence electrons are the ones an atom looses or gains during a chemical reaction (atoms try to be stable by having 8 electrons in their outer most shell) .. for example atoms in group 1 have 1 electron in their outer shell that they want to loose so the valency is 1 .. In group 5 they need to become 8 so they gain 3 electrons so the valency is 3

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HELPPPPPPP PLZZZ

Ganezh [65]

Answer:

The potential energy the apple had due to its height is converted to kinetic energy

Explanation:

When an apple falls from the tree to the ground, its energy of position stored as gravitational potential energy is converted to kinetic energy, the energy of motion, as it falls. When the apple hits the ground, kinetic energy is transformed into heat energy.

7 0

3 years ago

A block of copper has dimensions of 32cm x 21cm x 11cm. What is the mass of the block of copper ?

MatroZZZ [7]

Explanation:

The volume of the copper block is:

$32 \times 21 \times 21 = 14112 \: {cm}^{3}$

The density of copper is 8.96 g/cm³

So the mass of the copper block is

$14112 \times 8.96 = 126443.52 \: g$

or 126.44352 kg.

3 0

3 years ago

Chemical reactions that combine simple molecules and monomers to form complex structures are known as

jolli1 [7]

Answer: Anabolism

Explanation:

Chemical reactions that combine simple molecules and monomers to form complex structures are known as ANABOLISM.

Anabolic reactions which are also called biosynthesis reaction is a type of metabolic reaction in the body that forms larger molecules through combination of smaller molecules with the use of energy in the form of ATP molecules. Example if anabolic reactions in the body includes:

- formation of polysaccharide from monosaccharides,

- formation of triglycerides from fatty acids,

- formation of nucleic acids from nucleotides and many among others. I hope this helps, thanks.

3 0

3 years ago

Convert 4.50 e23 atoms of CO to grams.

hichkok12 [17]

Answer:

10.4664 grams of CO

Explanation:

Remark

There's a couple of things you must look out for in this question.

1. The use of the term atoms. There are 2 atoms in each mol of CO

2. You need to divide by 2 to find the number of molecules which will lead to moles.

Step one

Divide the number of atoms by 2

4.50 e^23 / 2 atoms = 2.25 * 10^23 molecules.

Step Two

Find the number of moles of CO

1 mol of anything is 6.02 * 10^23 molecules in this case

x = 2.25 * 10^23 molecules

1/x = 6.02 * 10^23/2.25 * 10 ^23 Cross multiply

1 * 2.25 * 10^23 = 6.02*10^23 * x Divide by 6.02 * 10^23

2.25 * 10 ^ 23 / 6.02 * 10^23 = x

x = .3738 moles of CO

Step Three

Find the gram molecular mass of CO

C = 12

O = 16

1 mole = 12 + 16 = 28 grams.

Step Four

Find the number of gram in 0.3738 mols

1 mol = 28 grams

0.3738 mol = x Cross multiply

x = 28 * 0.3738

x = 10.4664 grams

7 0

3 years ago

Protons are in the nucleus of the atom and have a positive charge. True or False?

gladu [14]

True. They are positive charged! Hope this helps

3 0

3 years ago